@KevinTheJedi
I just tested one more thing and found little strange, not sure if this has anything to do with Auth2.0, probably not
On the same server where I have installed v1.17-RC3 with the LDAP plugin, I can only log in once, the user shows up in the user list, but can't log in again
So, I installed 1.16.3, and LDAP worked fine