Hi @pablo1816, if this is still relevant:
Could you please install taiga-contrib-ldap-auth-enhanced instead of (what I presume) taiga-contrib-ldap-auth-ext?
The “enhanced” plugin is a fork of the other one which I maintain, and which since yesterday contains better logs.
Please then try running the Python script from the Troubleshooting section, and tell me what the error message is. The error explanation table might then help to find the root cause.