Microsoft Graph Api Passing special characters as encoded string

Question

I am trying to fetch some emails based on internetmessageid. However "+" the plus symbol/special character is not getting passed as it is and is getting rendered as a space when sending as encoded. For example I have this as an example internetmessageid:- 'CA+Z2W6fgjsE0--ExX98Pr=******@mail.mymail.com' . Now when am passing it encoded/doublencoded, the rest of the string is rendered properly, however the "+" is getting considered as a blank space. Hence not able to fetch certain emails. I have tried passing it as %2B and also as %252B and as %2b. It's just not accepting "+" at all. Kindly suggest me a solution.

Answer 1

The Microsoft Graph API does not support the plus (+) symbol in the UserPrincipalName (UPN) in the email. The allowed characters for UPN are A - Z, a - z, 0 - 9, ’ . - _ ! # ^ ~.

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