RHey @Mahanth Kumar! Can you verify that you've correctly filled in the SMTP configuration? This could possibly be an issue with SMTP. :gigipixel:
SSo, what was it that needed to be fixed?
RHi there! What ended up being the fix?
S"token has expired" might be due to too short token life time or maybe any system clock was off by too much. Assuming the later was the case waiting/ rebooting could solve the issue as an automated time sync could be triggered in between.
But that's a pure guess..
But that's a pure guess..