It is rare that a previous TN would be pulled based on a denial for a new one. The only thing that could cause this would be if the officer determines that your education doesn't qualify you for the category, in which case he might dig back into your old one, and deny you for the same reason.
Of course if you were somehow to be found inadmissible (criminal, immigrant intent) then your current status would be pulled.
Otherwise, your old TN is still good
Thanks Nelsona!
Just to share my experience - yesterday, I drove to the border (Ambassador Bridge POE near Detroit)
The officer at the booth asked me - "you already have a TN which is good, do you want to apply for a new company, I said yes, I am here to get TN for the new company and I will keep both old and new TNs". She said, fine and routed me to office
Officer inside the inspection area - asked me where I work and told him and category, then he said "you still work at the current company", I said yes
I gave the TN letter and and tried to give all documents to Officer for review. He said, "I believe you" I don't need to see any documents", within minutes took my photograph and fingerprints and issued TN, while giving the passport back to me, he asked me" You still work for your current company right?" I said, Yes and, I got the passport back.
I just looked at the passports there only just to make sure everything is good - the Old TN I94 is still there, he didn't take it out and for the new TN, he just stamped by annotating "TN" and with validity date of 3 years from yesterday. I asked the officer, I see the old I94 but no new I94, he replied saying they phased out issuing I94 cards, its just the stamp, all will be in the system. He also said, he stamped with complete full 3 years validity though my passport expires 6 months shorter than the requested 3 years, he asked me to bring the passport when renewed, he will match the complete 3 years validity.
I came back home and checked online to see the travel history in CBP I94 portal, my entry listed with a new I94 with the new validity date (it appears that its the most recent entry under) which is upto my passport expiry. the I94 numbers are different - old paper I94 card has a different I94 # and new one found in the CBP I94 portal is different.
As I don't have any paper I94, can I download and provide the I94 I am seeing in the CBP portal to the new employer? Can they verify thats its their TN?
Is there a way to check status for all the I94s issued? like by giving I94 control# etc.,? Not sure, its possible
appreciate if anyone can share inputs around this, thanks