It’s a very annoying bug! It shows that the developer needs to be verified first so you can install or use the apps. But verification is only needed for Enterprise Certificates. You are using a Personal Developer Account, You don’t need to verify!
Recently since July 2025, apple has done something and many users are facing this issue. This "Unable to Verify App" doesn't mean your certificate is revoked. It is an apple server side issue which you and i cannot fix. But some community members have tried various methods which helped them fix this issues. You can try something, of it works, great for you.
Here are the fixes:
Fix 1
Fix 1
1. Go to “Settings > Privacy & Security”
2. Scroll Down to Developer Mode and turn it off
3. Restart the device
4. Open the sideloaded app or reinstall the sideloaded app and then it will tell you to Enable Developer Mode again.
5. Turn it on and you are good to go!
Disclaimer: You may need to try multiple times for it to work!
Fix 2
Fix 2
Turn off Developer mode and restart your iPhone and after sometime (not instantly) try to install an application then it will say you need to turn on the developer mode and then turn on the developer mode and it should work fine. Some users have to wait for hours to fix this some users like one week there is no ETA but it would be fixed by itself.
Fix 3
Fix 3
Tap on the sideloaded app, multiple times and it should open after some tries.
Fix 4
Fix 4
Go to Settings > Date & Time. Turn off "Set Automatically" and change the date to a time far in the future (e.g., 2032).
Power cycle your device means hard restart your device. (Press the volume up button briefly, then the volume down button briefly, then press and hold the side button until the Apple logo appears).
After your device turns on and some time passes, a certificate error popup will appear. When you tap the app, you will get a message stating that the app is no longer valid.
Now, go back to Date & Time, re-enable the "Set Automatically" option, and restart your phone.
You would now be able to open not only the newly installed esign app but also the other apps that were previously blocked.