Enabling Firebase for Worker Custom Domain

I am trying to enable Firebase oauth for an app running via Worker. To register and prove I owned the domain i for the app , I purchased a new domain from Cloudflare and was able to then setup a subdomain for my app.

I was able to add the TXT record required by Firebase to verify ownership.

Then Firebase says that i need to add an A record for the subdomain with the IP address and displays "Needs Setup". Cloudflare DNS management says that the A records are managed by the Worker and I cant add a second one.

What is the right way to set up the site? Is using Workers the problem?
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