Hello, good day and thanks for your question. Sorry to know about this and I understand that you are having an issue with your account that is being tagged as on the go for Microsoft Rewards.
This scenario usually happens if you have travelled or went to a different country or region in which your account will be have a geo-tag on it and if you have done so, you may clear/forget every connectivity that you have used whether it is from your mobile device or your computer which is may still have an effect and you can also clear or clean up the browser that you are using as well.
If it will still not work afterwards, you may submit a ticket via https://rewards.bing.com/support for your account to get checked internally by the rewards team as it is important to get this cleared on the backend of things to avoid seeing the on to the go message. Response times may vary due to workload or other tasks at hand, but rest assured that they will review your case and let you know on the outcome.