I had the same issue and couldn't get the apache2 URL Rewrite to work in Ubuntu . The thing that finally fixed it was enabling it in the main apache config, not just the site config.

Steps:
1) sudo nano /etc/apache2/apache2.conf
2) Find

<Directory /var/www/>
        Options Indexes FollowSymLinks
        AllowOverride None
        Require all granted
</Directory>

3) replace AllowOverride None with AllowOverride All

<Directory /var/www/>
        Options Indexes FollowSymLinks
        AllowOverride All
        Require all granted
</Directory>

4) Restart apache
sudo systemctl restart apache2

System Specifics:

osTicket Version 	1.17-git (?) — 8fbc7ee is available
Web Server Software 	Apache/2.4.52 (Ubuntu)
MySQL Version 	8.0.32
PHP Version 	8.2.1

Just to add to this;
[root@tickets /]# httpd -M|grep write
rewrite_module (shared)

In (Centos) /etc/httpd/conf/httpd.conf
<Directory "/var/www/html/osticket"> # YOUR EXACT directory
AllowOverride All
Options FollowSymlinks
Require all granted
</Directory>

systemctl restart httpd

That worked for me - Explicitly defining the osticket directory was the key

yashbhardwaj
Remote Mailbox/Outgoing and SSO are two things, if you don't want to pull emails from MS365 then you don't need to set up the Mailbox part, just setup SSO something like this:
https://docs.osticket.com/en/latest/OAuth2/Microsoft%20Authentication%20(SSO)%20Guide.html

Hello KevinTheJedi

This is what I have configured in the plugin

And I have left the vhost as clean as possible.

I have modrewrite enabled, which I'm missing

in my directories I don't have the path to api/auth/oauth2

I might be configuring the wrong redirect url in Azure ?.

Thanks

Hello, I have not solved the problem, I want to be able to access osticket through Microsoft365 with the Oauth2 plugin.
I'm not an expert, I'm forgetting something.
I leave you the information to see if you can help me.

When I login through 365 I appear to be logged in, but I am redirected back to the home page and do not enter the agent panel.

The authentication if it is being done through Microsoft 365

This is the content of the login errors access.log

When I log in with a local user it does redirect to the path https://soporte.ticket.com:6971/scp/tickets.php?queue=1&dir=1&sort=10"

These are the details of my operating system

Distributor ID: Debian
Description:    Debian GNU/Linux 10 (buster)
Release:        10
Codename:       buster

Version of osTicket installed

This is the Azure configuration, but I'm not sure if the Redirect URI configured in Azure is correct.

Rewrite module is enabled and working

sudo apache2ctl -M | grep rewrite
 rewrite_module (shared)

This is the content of the .htaccess directory /var/www/html/osticket/upload/api/.htaccess

<IfModule mod_rewrite.c>

RewriteEngine On

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_URI} (.*/api)
RewriteRule ^(.*)$ %1/http.php/$1 [L]

</IfModule>

This is the content of the apache2 configuration directory /etc/apache2/apache2.conf

<Directory />
        Options FollowSymLinks
        AllowOverride All
        Require all granted
</Directory>

<Directory /usr/share>
        AllowOverride None
        Require all granted
</Directory>

<Directory /var/www/>
        Options Indexes FollowSymLinks
        AllowOverride All
        Require all granted
</Directory>

This is the content of the apache2 port configuration directory /etc/apache2/ports.conf

Listen 82
<IfModule ssl_module>
        Listen 6971
</IfModule>

<IfModule mod_gnutls.c>
        Listen 6971
</IfModule>

This is the directory contents of the vhost-ssl file directory /etc/apache2/sites-available/osticket-ssl.conf

<IfModule mod_ssl.c>
        <VirtualHost *:6971>
                ServerName soporte.ticket.com:6971
                ServerAdmin rambo@ticket.com

                DocumentRoot /var/www/html/osticket/upload/

                ErrorLog ${APACHE_LOG_DIR}/error.log
                CustomLog ${APACHE_LOG_DIR}/access.log combined

                SSLEngine on
                SSLCertificateFile /etc/ssl/private/soporte.ticket.com.crt
                SSLCertificateKeyFile /etc/ssl/private/soporte.ticket.com.key

                <FilesMatch "\.(cgi|shtml|phtml|php)$">
                                SSLOptions +StdEnvVars
                </FilesMatch>
                <Directory /usr/lib/cgi-bin>
                                SSLOptions +StdEnvVars
                </Directory>
                <Directory /var/www/html/osticket>
                        Options FollowSymlinks
                        AllowOverride All
                        Require all granted
                </Directory>
        </VirtualHost>
</IfModule>

This is the directory contents of the vhost file directory /etc/apache2/sites-available/osticket.conf

<VirtualHost *:82>
        ServerName soporte.ticket.com:6971
        ServerAdmin rambo@ticket.com

        DocumentRoot /var/www/html/osticket/upload
        RewriteEngine On

        ErrorLog ${APACHE_LOG_DIR}/osticket.log
        CustomLog ${APACHE_LOG_DIR}/osticket_access.log combined

        <Directory /var/www/html/osticket>
                Options FollowSymlinks
                AllowOverride All
                Require all granted
        </Directory>

</VirtualHost>

Thank you very much for your help