A professional diagramming tool that helps users visualize complex information through easy-to-understand diagrams.
Hi Britt Hall,
As per the description, it seems like the Visio 2019 license is still valid and connected to your account, but suddenly, Visio desktop application is saying Inactivated or Read-Only Mode which prevented you from editing or creating files.
If my understanding is correct, I suggest you using the official tool OLicenseCleanup.zip file to reset the local activation environment and then restart Visio to enter your account again on the start page, and see if the license connection can be active again. Reference: Reset activation state for Microsoft 365 Apps for enterprise - Microsoft 365 Apps | Microsoft Learn
If the issue persists, could you please share a complete screenshot from Microsoft account | Services & subscriptions regarding to the Visio license for a further troubleshooting?
Please correct me if I made any misunderstanding and I will be here waiting for your updates.
Appreciate your time and patience. Hope you a nice day and stay safe!
Best Regards,
Mia