Hi!
Are there any error messages when you open Teams desktop application?
Can you account sign in normally in another device?
In this case, we recommend you try to see if you can login in Teams web client with no issue(https://teams.office.com).
The following link shows some known issue you might run into when you sign into Teams for your reference:
https://support.microsoft.com/en-ie/office/why-am-i-having-trouble-signing-in-to-microsoft-teams-a02f683b-61a3-4008-9447-ee60c5593b0f
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