Hi @Data Wizard
After many tests, I can come to the conclusion that returning the
validation attribute is not supported. Before this, I have set
columnValidation for column in SharePoint. I suggest you submit a user voice to add a support request for the
columnValidation attribute, and I will vote for you.
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Yes I did, in SharePoint itself not via MS Graph. I edited the column in list settings, and used the Column Validation option to enter a formula and message. Would it make a difference if I tried adding column validation via MS Graph?