Using Microsoft nameservers, Google Domains, and Firebase hosting

Question

I have a client who is using Office 365 for email and has changed the nameservers on Google Domains to point to Microsoft nameservers (ns1.bdm.microsoftonline.com, etc), so he can utilize the @domainname.com email extension (and other Office products). Unfortunately, this is messing with my normal groove on how to link my Firebase React projects with Google Domains via adding resource values (i.e. @ A record with a value of 111.111.1.111) because as Google warns me right there:

It looks like you've changed your name servers. All settings for your domain (including website, email, synthetic records and resource records) are currently disabled. To enable these settings, you will need to restore the Google Domains name servers.

I can't restore these nameservers to Google, because it will mess/disable his emails. So what to do? I have exhausted my Google searches for an answer, and unsure of what direction to look for an answer. How do I link up my app with Firebase hosting with my Google Domain's domain while still maintaining Office 365 @domainname.com email extension for my client? Maybe I need to add the records on Microsoft's side? Do I need him to transition to GSuite? I'd prefer not to tell him he needs to, but maybe that's the only solution!

Answer 1

It's a bit misleading. The domain is with Google Domains, and Google is saying "All settings for your domain that you might expect us to manage via Google Domains" are disabled - meaning you can't manage them in Google Domains. Instead, they have to be managed in Office 365 (or wherever the nameservers are).

You can get the ip addresses Firebase gives you, send them to your client, and instruct them to update the domain's main A record and www A record (or CNAME) to point to the Firebase ip addresses.

Everything will work just fine - it's just Google telling you that it no longer manages the DNS for the domain.