I finally registered to GHL 3 days ago and today submitted my A2P Registration after reading a lot and trying to figure out what to do since I'm using my DBA instead of my LLC.
What I ended up doing is using my LLC for business name with address provided to IRS for EIN and the DBA website. I added in the footer "<DBA Name>. A DBA of <LLC Name>".
And for sample message for business name - DBA Name (LLC Name).
Finger crossed.
Now I'll setup calendar and add to the website and start prospecting :-)
Quick Update: Brand Status Approved 🥳
Update 2: In "SHAKEN/STIR Trusted Calling (Voice)" you can put your DBA.