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In a multitenant deployment architecture, you can import a specific Licens per tenant.
Import-NAVServerLicense 'MicrosoftDynamicsNavServer$MyInstance' -LicenseData ([Byte]$(Get-Content -Path "fin.flf" -Encoding Byte)) -Database Tenant –Tenant Tenant1
However, how to switch back to default Master Database Licens again? There are no PowerShell commands for delete / remove current Licens from a tenant and go back to default Master licens again.
If you have the file, you may re-import it.
keep your original license on your nav sever and , import it again
Re-import to a specific tenant do not solve the problem - then this tenant still have its own variant / copy and not the default master.
You have an option while importing to make it global:-