@Ganesh1 Are you able to login on Uphold separately in another tab?
Did you get any error like this immediately after when Uphold redirected to rewards page? -
Do have an external wallet address on brave://rewards-internals?
Do you think you have exceeded 4 lifetime device limit on Uphold, including all uninstall and reinstalls of Brave that were previously connected to your Uphold account?
You can try this- Make sure your Brave is Updated. Disable Brave Shield on Uphold page where it asks to authorise and then login. Do this after you are logged in to Uphold in another tab. .
If this doesn’t work, tag someone from support team. They can help you further.