Mautic api 401 unauthorised while connecting mautic in pabbly

When I log in to Mautic in Pabbly. 401 access denied error is coming. Please help with this. I have connected to other mautic in Pabbly all are working fine. Only a few mautic show this issue all have the same permissions and are also on the same server.

“{“errors”:[{“message”:“API authorization denied.”,“code”:401,“type”:“access_denied”}]}”

Try clear cache. If you enabled API in Configuration at that time it could help.