Read this: https://iohk.zendesk.com/hc/en-us/articles/900001979086-ITN-Rewards-When-and-How-to-Redeem

"Important points to consider:

1. Users running Daedalus 2.0.1 are not yet able to redeem ITN rewards at this time.
2. Rewards earned from delegating on Daedalus Shelley Testnet are not redeemable and was intended for testing purposes only. "

Looks like from delegating you can't redeem the rewards, only from staking on your own.