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Fritz23 said
I just tried to link my National Bank Checking Account to Tangerine from the Tangerine side but it didn't work, I got am error message to call Tangerine. Is this just an accident or is it not possible to link National Bank Accounts from external accounts?  

I linked NB from the Oaken side. It used Flinks. A transfer pulling from Oaken worked.

RetirEd said
Does Tangerine still have a limit on linked accounts? Used to be only three...  

It does. Also, Tangerine still offers "old style" linking which they call "Link Manually:" enter bank and account details, they do microdeposits. This "Link Manually" started to fail for me since 2025, with an error message to call Tangerine, even for accounts I previously linked (then unlinked) with it.
Another option, "Link Instantly," where you have to provide login info for FI account you want to link, does not fail.

I escalated "Link Manually" issue to Tangerine, got acknowledgement but no meaningful response in over 6 months now. I suspect they are trying to sunset old style account linking.

If OP tried "Link Manually" process with National Bank Checking Account, I would suggest to try "Link Instantly" instead. I can see National Bank in the list of FIs for which "Link Instantly" option is available.

Wrayzor said

Alexandre said
Another option, "Link Instantly," where you have to provide login info for FI account you want to link, does not fail. 

The Link Instantly is via Flinks or Plaid the last time I checked. No go for me.  

Why not? Is it because you are concerned you share login credentials with third party? You should be.
I am concerned, too, but this is what I do: immediately after successful linking of account I change that account login password (it'll be National Bank's account login password, in this topic).
External link stays, login information third party collected becomes useless for anyone (now with wrong password).

Alexandre said

Why not? Is it because you are concerned you share login credentials with third party? You should be.
I am concerned, too, but this is what I do: immediately after successful linking of account I change that account login password (it'll be National Bank's account login password, in this topic).
External link stays, login information third party collected becomes useless for anyone (now with wrong password).  

Yes, I have concerns about sharing credentials. Your method secures future logins. But sharing of credentials violates most, if not all, banking agreements. And who knows what information is scraped (and where it goes) when the third party has access. It was mentioned here recently that tighter regulations might be put in place on the third party providers. So the concern is more than just me.

There are plenty of alternatives and it's not any burden to avoid Flinks/Plaid for account linking.

I don't get it either. They're tempting you to break your agreement with them, and then what? If something goes awry, I'd hazard a guess that they point to the Ts & Cs to pin the blame on the user.