Hi @Inactive User,
There's 2 things you could try in this situation:
Reach out to support with your public IP address such as 18.104.22.168 which you can get from https://whatismyipaddress.com/ and support can whitelist your IP address to bypass basic authentication.
You can append the htaccess username and password to your URL such as: https://username:firstname.lastname@example.org/t5/whatever
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