Custom Domain Help

I recently upgraded my app to “Starter Team” and it says that we can use the custom domain feature but when i tried to update the domain it said that I had to upgrade.
On the pricing page it states that the $25 a month "Starter " upgrade option comes with the custom domain feature. I purchased the Starter upgrade based on the fact that this is the only app/website that I plan to make and that it it says online that this comes with Custom Domain usage.
I pressed the “Share” button and then when i went to input the custom domain. It says that Custom Domains are available on paid team plans. I have a paid team plan so this should be working.

Can you show us some screenshots of the error?