I had a problem using a medical portal and a login issue w/ resetting passwords.
When I forgot my password and clicked on the 'Forgot password', I entered my email address and then a msg to go to my inbox to get the link to reset the pswd. I never got the link (no matter how many times I tried)!
After working w/ website support I find that Yahoo and GMail don't support certain portal/website (eg, Athena Health portal and Physicians Mutual! So the email w/ the link to reset the password goes to the TRASH folder!!
I'd looked in the inbox and Spam folder, but never the trash folder.
ChatGPT explains in lengthy detail why it doesn't support certain applications.

Why can't Yahoo / Gmail just send it to the inbox!! It's a legit email. Yes, it's annoying that a simple request to reset the password would cause this problem because of whatever restriction (that I don't think should be a restriction)!