If you haven't already, add the email address to your Reclaim accounts
Navigate to Account -> Calendars.
Click Add another account.
Select the email address or Use another account.
Go through the Google authentication prompts.
Once connected, the email address will show in your email list.
Click the caret next to the email you want as your new main to expand details.
Click the Use as Main below the email address.
Confirm the switch by clicking Switch Main Account.
Once your main has been switched, all your existing Reclaim data (including any incomplete Tasks) will be migrated over to the primary calendar associated with that new Main email.
View of Accounts page.
Issues switching the Main email address
If you are running into trouble switching a connected email as your Main email on your Reclaim account, the likely causes may be:
Reclaim lost access to the email and calendar.
The email is already a Main email for another Reclaim account.
Click the Reconnect button next to the email address.
Confirm the requested permissions.
Email is already a Main email
Log into Reclaim using the email address you want as your Main account. This will find the ghost account taking up your email address.
Log back into Reclaim using the old email address associated your Main account.
Switch the Main account.