Here's my Business Manager ID: 407580547261660 and it's verified by Meta.

I have created an app in Developers portal with the name 1st Cloud API and trying to add a new WhatsApp number. I already had one earlier and trying to add a new one. But unfortunately, it didn't allow me to add one as it says "You have already linked the maximum phone numbers". I tried checking my WhatsApp account and can confirm that there's only one.

I tried getting in touch with the FB Support team. They asked me to delete any secondary account and retry after few hours but even after 2 days I'm unable to add a phone number.

Can you please look into this on priority and help me out as the ads are running.

Please try to increase the phone numbers limit.