Just to rule this out, when you are connecting to a QLab 5 workspace, be sure to double-check that the workspace has "Edit" and "Control" permissions enabled for the OSC passcode you are using to connect. These permissions are set in Workspace Settings > Network > OSC Access.
If you are connecting to v4 or have double-checked that your v5 workspace has all of the correct permissions enabled, then perhaps the App Store receipt needs to be refreshed on your device.
You do need to be connected to the Internet to initially restore your in-app purchases, in order to download your transaction history from the App Store. After that, the validation happens on device and does not require an Internet connection.
You can try doing a "force" restore in the QLab Remote Purchases screen:
1. Make sure your device is connected to the Internet.
2. Launch QLab Remote.
3. Tap "Purchases" in the upper-right corner of the main screen.
4. Tap the "Restore Previous Purchases" button twice.
5. After the second tap, the button will change to read "Force Restore Previous Purchases".
6. Tap "Force Restore Previous Purchases".
7. In the prompt that appears, note the Apple ID. Make sure this is the same Apple ID you used to make your QLab Remote purchases.
8. Type in your Apple ID password, and tap OK.
If the Apple ID shown in the prompt in step 7 is not the account you used to make your purchase, then you'll need to log in to "Media & Purchases" using the correct account in your iOS Settings app > Apple ID > Media & Purchases and repeat the steps above.
If performing a force restore does not solve things for you, then please send us a "Contact Support" message from QLab Remote on your device. Be sure to include your email address and check "Include console logs" so that we can try to see more closely what your device is seeing.
Thanks!
Brent