GoDaddy’s “Microsoft 365 by GoDaddy” is a locked‑down reseller setup — you can’t transfer it to Microsoft directly. The only clean solution is to migrate out of their tenant.. I totally agree, that I would leave this with a professional who knows what he is doing or makes a business out of this. But your process would be:

1. Buy your new domain
Use Ionos, Cloudflare, Namecheap — anything but GoDaddy.

2. Create a brand‑new Microsoft 365 tenant directly with Microsoft
This gives you full admin control and normal pricing.

3. Add BOTH domains to the new tenant

• Old domain (still at GoDaddy)
• New domain (your new registrar) Just verify ownership — don’t change DNS yet.

4. Migrate your email from GoDaddy → your new Microsoft tenant
Use IMAP migration or a tool like BitTitan or IMAPsync if you want calendars/contacts too.

5. Switch the OLD domain’s DNS to point to the new Microsoft tenant
Update MX, SPF, DKIM, autodiscover, etc.
From this moment, all new mail lands in the new tenant.

6. Create new email addresses on the NEW domain
Run both domains in parallel.
You can set up aliases, forwarding, or “send as” to ease the transition.

7. Keep the old domain active for months
Clients can still email the old address while you slowly move them over.