If all 8 are on the same B.Net account you should not run into this issue, unless the option to "request authenticator on every login" is enabled in your B.Net account.
If the 3 new licenses are on a different B.net or each is a separate B.Net account then you will need to use virtualization to safe the login session for all accounts:
https://isboxer.com/wiki/FAQ#Why_am_...g_to_log_in.3F
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