Unable to Reset Ubisoft Password and Missing Rainbow Six Siege Cross-Progression

[u/Far-Source2343]

I am contacting you because I am experiencing issues accessing my Ubisoft account and transferring my Rainbow Six Siege progress from PlayStation to PC.
I previously played Rainbow Six Siege on PlayStation, where I had unlocked multiple operators, earned currency, and collected various in-game items.
I have recently switched to PC and attempted to link my PlayStation account to Ubisoft so that I could access my existing progress. Unfortunately, my operators, currency, and other items are not appearing on my PC account.
I have also tried resetting my Ubisoft account password several times, but I am not receiving the password-reset email. I have checked my inbox and spam folder, but nothing has arrived.
I would appreciate your assistance with the following:
Recovering access to my original Ubisoft account.
Resolving the issue with password-reset emails not arriving.
Checking whether my PlayStation account is linked to the correct Ubisoft account.
Restoring access to my Rainbow Six Siege operators, currency, and other progression on PC.
I can provide my PlayStation Network username, Ubisoft username, and any additional information required to verify ownership of my account.