There are multiple complaints from Pioneers that Pi wallet private passphrase is not working. If you are sure your private passphrase is correct and it worked for you before, please try the below to access wallet again.
1. In your phone settings, make sure that Private DNS if turned OFF. Below is how to do it:
a. On your phone: Open Settings app.
b. Tap Network & internet >>> Advanced >>> Private DNS. If you can't find it, search for "Private DNS." If you still can't find it, get help from your device manufacturer.
c. Select Private DNS Mode: OFF.
2. Close Pi browser app, enter again via Pi app menu >>> Pi browser.
Now again try to unlock Pi wallet with your private passphrase.
👉 When all done, in your phone settings select Private DNS Mode: AUTOMATIC