Sign in with Google or Microsoft
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You need a Google account to use GPT for Sheets and Docs. 
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You need a Microsoft account to use GPT for Excel and Word. 
- Google 
- Microsoft 
When you launch the GPT for Sheets and Docs add-on:
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The add-on works with the Google account you are currently using. 
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In GPT for Sheets, you need to sign in again when you first use the bulk AI tools. This is to grant a required additional permission. 
If you have multiple Google accounts, such as a personal account and a work account, you can switch between them to ensure you are using the correct account in GPT for Work.
When you launch the GPT for Excel Word add-ins:
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From a web version of Excel or Word: You need to sign in with your Microsoft account when you first launch the add-in. 
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From a desktop version of Excel or Word: - 
If you're already signed in with your Microsoft account, the add-in automatically uses that account. 
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If you're not signed in or using multiple accounts, the add-in prompts you to choose an account. 
 
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If you have multiple Microsoft accounts, such as a personal account and a work account, you can switch between them to ensure you are using the correct account in GPT for Work.