Hello LEB_129,
Welcome to the Microsoft community.
You are experiencing an issue where the Read Aloud feature is not working properly when opening PDF files in the Microsoft Edge browser. Although you have tried updating your browser, clearing cookies, and testing in multiple versions of Edge, the issue persists. The blue loading bar continues to display at the top of the PDF, but the read aloud feature never kicks in.
Looking forward to more information from you to help me better analyze your problem:
It is recommended that you perform the following steps:
Reset Microsoft Edge:
Open the Edge browser.
Click on the three dots (Settings and More) icon in the top right corner.
Select Settings.
In the left-hand menu, scroll to the bottom and select Reset Settings.
Select "Reset to default settings".
Confirm the reset.
Disable extensions:
Sometimes third-party extensions may interfere with the read-aloud function of PDF.
Open the Edge browser.
Click on the three dots (Settings and More) icon in the top right corner.
Select Extensions.
Disable all extensions and try to use the read-aloud feature again.
Start Edge in Safe Mode:
I suggest you go into Safe mode to see if the system itself has a problem. We can use this to isolate the problem as Safe Mode enables a minimal number of additional services or apps to rule out issues caused by personalized settings and third-party apps.
The above steps will help to narrow down where the problem occurs.Looking forward to you sharing more information.If you have any other questions, please contact us
Best wishes
Lyla Liu - MSFT |Microsoft Community Support Specialist