The user name must consist of at least 3 and up to 40 characters and only allows to use alphanumerics (a-zA-Z0-9), dots (.), dashes (-), underscores (_) and spaces. The first character must be a letter or number.
https://github.com/sensebox/openSenseMap-API/blob/2e645bdc4c80e668720b5eaaf384a35d2909569e/packages/models/src/user/user.js#L30
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The user name must consist of at least 3 and up to 40 characters and only allows to use alphanumerics (a-zA-Z0-9), dots (.), dashes (-), underscores (_) and spaces. The first character must be a letter or number.