Hi,
I tried with Booked 3.2.1 to move to php8.0 and it worked perfectly.
When I tried to move to php8.1, I was unable to login using LDAP.
In log file, there were 'user not found'.
I downgraded to php8.0 and everything worked as expected.
I upgraded to Booked 3.5.4 but didn't try again with php8.1.
Did you change anthing in LDAP auth code between 3.2 and 3.5
Thanks