error when saving api key

I’ve created a service account key inside keap. When I save it on the plugin settings page, I’m getting the error, “There was an error while saving your settings.” I’m seeing this in the log file

[Fri Apr 07 10:35:35.500344 2023] [cgi:error] [pid 30445] [client 73.241.32.53:53539] AH01215: XML-RPC: systasis_xmlrpcmsg::parseResponseHeaders: HTTP error, got response: HTTP/1.1 401 Unauthorized, referer: https://domain.com/wp-admin/admin.php?page=gf_edit_forms&view=settings&subview=systasisgfifscrm&id=1

I’m using php 7.4

The page I need help with: [log in to see the link]