I'm trying to get my 5 digit pin but having trouble.
See https://ttlc.intuit.com/turbotax-support/en-us/help-article/personal-identification-number/difference-five-digit-self-select-pin-created-last/L4nSrJW5e_US_en_US
If you filed with TT online in 2020, and you log into the same account for 2021, your 5 digit e-file pin should automatically be applied to your return.