Word add-in error

Hello, I am unable to open Word add-ins. The add-ins catalog opens normally, but when I try to add or launch an add-in, I receive this message: “We couldn't connect to the '{0}' catalog server for this add-in.” The issue affects more than one add-in, including Mendeley Cite, and I have also tested it with more than one Microsoft account. Connected Experiences are enabled, and I have already cleared the Office add-in cache. Is this a known Office Add-ins or AppSource connectivity issue? I would appreciate guidance on the next troubleshooting or escalation step. Thank you.