The problem
You hit the SSO button from GP admin and you are getting an error message. Then under Logs > Single Sign On Log you are seeing a log like this
**********************************************************************************************
sso Log Begin - site.url
**********************************************************************************************
WPCLI Login Package is installed...
WPCLI Login MU plugin in place...
2
4
301
1447
No wpadmin_id.env existed - Using WP-CLI to generate ID is returning Errors, attempting to pull ID now...
Failed to extract usable ID...
Generating Payload:
Sending payload...
**********************************************************************************************
sso Log End - site.url
**********************************************************************************************How to fix this
The solution is pretty simple. SSH to your server and go to the path /var/www/site.url/logs and add the id of your admin to the file wpadmin_id.env
cd /var/www/site.url/logsls -lnano wpadmin_id.env