Does not list length limits and valid characters for Microsoft.Portal/Dashboards
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@MrCNeale Thank you for your query, we will further review it and get back to you at the earliest.
@MrCNeale - thanks for this feedback. I am adding dashboard to the list.
Thank you @tfitzmac for taking care of this issue.
The Microsoft.Portal/dashboards resource type allows a name length of 3 - 160 characters. It accepts alphanumerics and hyphens. However, you can add a tag named "hidden-title" to use other characters. That value is shown with the dashboard in the portal.
The update should be published this afternoon.