See "Is Passport available outside of the U.S.?" section of: https://help.pbs.org/support/solutions/articles/12000096220-...
PBS is not a producer, but rather a distributor of programming.
https://help.pbs.org/support/solutions/articles/12000096659-...
https://help.pbs.org/support/solutions/articles/5000694871-i...
This is not about being outside the US or using a VPN. This is about the pain of having to repeatedly log in.
See "Is Passport available outside of the U.S.?" section of: https://help.pbs.org/support/solutions/articles/12000096220-...
Some details that imply workarounds might be difficult (although I suggest instead better to Google for how to access):https://help.pbs.org/support/solutions/articles/12000096659-...
https://help.pbs.org/support/solutions/articles/5000694871-i...