Hi @Veblitz , I see 2 question:
what's is the service account access required to access shared mailbox services in Office 365 enterprise E5:
You can use the following permissions with a shared mailbox.
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Full Access: The Full Access permission lets a user open the shared mailbox and act as the owner of that mailbox. After accessing the shared mailbox, a user can create calendar items; read, view, delete, and change email messages; create tasks and calendar contacts. However, a user with Full Access permission can't send email from the shared mailbox unless they also have Send As or Send on Behalf permission.
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Send As: The Send As permission lets a user impersonate the shared mailbox when sending mail. For example, if Kweku logs into the shared mailbox Marketing Department and sends an email, it will look like the Marketing Department sent the email.
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Send on Behalf: The Send on Behalf permission lets a user send email on behalf of the shared mailbox. For example, if John logs into the shared mailbox Reception Building 32 and sends an email, it look like the mail was sent by "John on behalf of Reception Building 32". You can't use the EAC to grant Send on Behalf permissions, you must use Set-Mailbox cmdlet with the GrantSendonBehalf parameter.
Please help me with the standard plan that required for power platform and service account details:
This is completely depend upon your requirement or usage. I would suggest you to check Licensing overview for Microsoft Power Platform and download the latest : Microsoft Power Platform Licensing Guide.
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I hope this helps.
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Thanks,
ANB
