Connecting multiple Google Meet accounts is slightly different than connecting other web conferencing services like Zoom, Skype etc. Reason is that same email that you use for Google Meet is also connected to a Google Calendar.
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Here is how you can connect multiple Google Meet Accounts.

Say you have two Gmail accounts, [email protected] and [email protected] associated with your Google Meet accounts that you wish to connect.

(Skip this step if you have already connected both Gmail accounts)

You first have to go to calendars and integrations and connect calendars associated with both of these accounts.
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Linking your calendars allows you to sign-in into FreeBusy using all of those linked calendars.

Alternatively, You can also use following link to link calendars of
​Sign In With Your Calendar | FreeBusy

Click on option menu near your profile picture and see with which account you are currently signed in. If you ARE NOT signed in as one of account that you want to connect Google Meet with. Then sign out.

Here First, I will sign-in with [email protected]

Then navigate to calendars and integrations and click on "Link an integration"
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Then navigate to Google Meet and click on "Add"
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Click on "Link Google Meet" account and it will connect your Google Meet account to signed in Gmail account.
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Once done you will see your Google Meet integration in calendars and integrations.

Click on "Sign in with a different calendar" to sign-in into another Gmail account.

Here I will put [email protected] and Sign-in

Again navigate to calendars and integrations and click on "Link an integration"
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Then navigate to Google Meet and click on "Add"
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Click on "Link Google Meet" account and it will connect your Google Meet account to signed in Gmail account.
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