Hi @Rafael Dias ,
Have you left the older organization in your Teams?
Does this issue persist only in Teams for Linux?
What is your identity in your older organization? member or guest?
To my knowledge, if you have followed the steps listed in the instruction below to leave the organization, your account will not be permanently deleted in the organization's directory. It will be in soft-deleted status for 30 days. After 30 days, your account will be hard-deleted in that directory and you'll not view the organization in Teams anymore.
https://learn.microsoft.com/en-us/azure/active-directory/external-identities/leave-the-organization
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