Appian service accounts in portals

Hello, good afternoon. I am writing on this forum to ask about the operation of service accounts in the portals. When adding a service account, I do not know how to use that account to use said portal, since I do not know how to log in with said accounts, and in fact, if I want to configure their credentials, it tells me that "the waiting time has expired ". Additionally, I would like to know if the portals are accessible to everyone with access to their URL. Thank you so much.

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