I went to do Trading Privilege Verification for a new algo today, and couldn't because Oanda MT4 now requires 10-character passwords, and myfxbook was providing an 8-character password. Could you enable 10-character passwords?
There is an alternative way to verify your account, please refer to the link below and scroll down to 'Verifying my trading privileges (MetaTrader 4) - Option 2'. https://www.myfxbook.com/help#help_35
Please let me know if you have any additional questions.