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How to use Gmail alternative emails with Thunderbird?

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Description: I have a gmail account "abc@gmail.com" which is already being used by Thunderbird desktop client.

Recently I have added an alternative email to "abc@gmail.com" with my custom domain; "abc@xyz.com" Google Alternate Emails

Both email addresses are using same inbox. I can login from browser via 2 different emails with same password. I can write a new email and Gmail web UI let me choose between these 2 email sender addresses.

Reason: this custom domain has a custom server without a mail server. Instead building a mail server, we choose to use it with online services, which is already working perfectly fine up until this point.

Problem: It fails when I try to add "abc@xyz.com" in Thunderbird. Gmail's IMAP/SMTP settings guide

I get the error "Incoming server already exists", which is true and in this case shouldn't be an error but how it's suppose to be. Right? .

How can I succeed to add an email address to share the same "Incoming server" with already existing email in Thunderbird?

'''Description:''' I have a gmail account "abc@gmail.com" which is already being used by Thunderbird desktop client. Recently I have added an alternative email to "abc@gmail.com" with my custom domain; "abc@xyz.com" [https://support.google.com/google-ads/answer/1752343?hl=en Google Alternate Emails] Both email addresses are using same inbox. I can login from browser via 2 different emails with same password. I can write a new email and Gmail web UI let me choose between these 2 email sender addresses. '''Reason: ''' this custom domain has a custom server without a mail server. Instead building a mail server, we choose to use it with online services, which is already working perfectly fine up until this point. '''Problem:''' It fails when I try to add "abc@xyz.com" in Thunderbird. [https://support.google.com/mail/answer/7126229?hl=en#zippy=%2Cstep-check-that-imap-is-turned-on%2Cstep-change-smtp-other-settings-in-your-email-client Gmail's IMAP/SMTP settings guide ] I get the error "Incoming server already exists", which is true and in this case shouldn't be an error but how it's suppose to be. Right? . How can I succeed to add an email address to share the same "Incoming server" with already existing email in Thunderbird?

Chosen solution

I think you can address that at tools>accountsettings>server>manage identities. You do not add a new account.

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Chosen Solution

I think you can address that at tools>accountsettings>server>manage identities. You do not add a new account.