AutoSSL is completing the SSL validation for domains on your server and requesting the new SSL certificate from cPanel. The request is then processed by Sectigo to issue a valid SSL certificate for usage on your domains. At this time, Sectigo is having delays in issuing new SSL certificates which result in AutoSSL not being able to issue an SSL certificate for your domain in a reasonable time.
This also affects issuing hostname certificates for WHM and cPanel services.
The SSL provider Sectigo is currently having maintenance problems that are delaying new SSL certificates from this provider.
Additional information regarding the delay is available from Sectigo: https://sectigo.status.io/
There is no immediate solution to this other than to wait for the maintenance to complete.