NEED HELP - Ported from Verizon and unable to receive any SMS texts from Verizon phones, all else fine

Six weeks ago I switched 4 phone numbers from Verizon to T-Mobile and purchased 4 new phones.  While the other 3 work fine, mine has a very specific issue that no one has been able to resolve.

I can call and text phones on all carriers with no issue.  

I can receive calls and MMS texts from all carriers with no issue.  This includes sending photos and group messages.

I can receive SMS texts from all carriers, however I cannot receive SMS texts from any Verizon phone.  If a Verizon user texts me even one word, it is not received.  To make it worse, the sender does not know it was not received, and I do not know that they tried to send me something.  It is a business line that I've had for over 20 years and I now have pissed off customers and am missing out on potential new business.  

I have made dozens of calls to T-Mobile and Verizon tech support, and completed all the triage and troubleshooting steps, including:

New SIM cards (physical and E-sim), and switching to different phones.

Performed network and factory phone resets.

T-Mobile preformed a rebroadcast (re-port).

It is not a device issue and does not make a difference whether using Android or Apple phones.  

I have traveled to different states and the issue exists everywhere.  It is not related to towers, roaming, 5G coverage, etc.

Both T-Mobile and Verizon tech support say that the ports were completed successfully.  Naturally each points the finger at the other.

Getting past the first tier of support with either company has been challenging and frustrating.  This is way beyond a customer service rep going through a checklist of easy fixes.  I have gotten to higher level tech support and opened multiple trouble tickets with both carriers, and yet no one ever contacts me with any solutions.

No one has been able to determine exactly where in the normal process of a message being sent from the Verizon network and received by the T-Mobile that it is breaking down or getting hung up.  I would think this would be key to figuring out what is wrong.  

I have just filed a formal complaint with the FCC.  Unfortunately I did not do this weeks ago.  I have zero confidence that it will lead to any resolution anyway.  

At this point, I cannot wait any longer while the issue continues, and I lose business. 

Please is there anyone who has experience with this exact issue and can help?  Thank you very much!