Hello Damien Size,
You’ve run into a known issue in Azure Logic Apps (Standard) where a workflow created with an invalid name (like one containing spaces) breaks the Workflows blade and prevents it from loading.
Root cause: Get AR Invoices - TEST workflow contains Contains spaces, which are not supported, Allowed characters only: A–Z, a–z, 0–9, -, _, (, )
To resolve this issue please follow below steps:
Open Kudu: Logic app> development tools> advanced tools > click on GO.
Debug Console → CMD → site/wwwroot/workflows



Locate - Get AR Invoices - TEST
and rename it. like: GetARInvoices_TEST
Finally restart the logic app.
Please accept as answer and do a Thumbs-up to upvote this response if you are satisfied with the community help. Your upvote will be beneficial for the community users facing similar issues.