Everytime you change your password in Google you need to reconnect your account in Introist. Here are steps required to reconnect.
Go to ‘Settings’
Log into Introist and from left side menu select ‘Settings’
Reconnect an email
Under ‘Google accounts’ click three dots next to the correct email...
and click ‘reconnect’
Follow instructions given by Google
If you have logged into multiple google accounts, select the correct google account. If you have not any account active, log into the correct account.
Review the access Introist will get and click ‘Allow’.
🎉 Now your account is reconnected and Introist can again send those beautiful emails and calendar events on behalf of you!