How to handle Adding more App permission to Azur AD app after enabling access through that app

Hi,

We have one App in Azure AD, through which we enable oauth Access for our SharePoint Application. For some reason we need to increase our App's permission. If we change our App's permission then all our old systems where we have enabled access before is throwing "401- Access denied exception".

Re-enabling the access also doesn't help. How to handle this situation.

Thanks,