I keep getting "invalid_grant" when trying to connect to a RESTlet with OAuth2.0 M2M. Any tips/tricks to get past this?

AI generated answer (using internal Slack threads):

The "invalid_grant" error you're encountering when trying to connect to a RESTlet with OAuth2.0 M2M could be due to a variety of reasons. Here are a few things you could check: 1. Ensure the correct scope: Make sure that the scope of your token includes RESTlets. If the scope is not correctly set, you might encounter an "invalid_grant" error. 2. Check the token's validity: Tokens in OAuth 2.0 have a limited lifespan. If your token has expired, you will need to refresh it. Note that the refresh token is also valid for a limited period (usually 7 days). After this period, you will need to go through the OAuth 2.0 flow again to obtain a new refresh token. 3. Use OAuth 2.0 Client Credentials Flow: This is a specific type of OAuth 2.0 flow that might be more suitable for your use case. It's designed for server-to-server communication and doesn't require user interaction. You can find more information about it in the NetSuite Help Center. Remember to double-check your integration settings and ensure that everything is set up correctly. If you're still encountering issues, you might find it helpful to go through a step-by-step guide or tutorial on setting up OAuth 2.0 with NetSuite. ****** Disclaimer: This response was generated by an artificial intelligence assistant based on previous conversations from multiple Slack channels, and may contain inaccuracies or mistakes. ******