Why am I getting INVALID_OAUTHTOKEN error on API access?

Why am I getting INVALID_OAUTHTOKEN error on API access?

There are several reasons why you might face this error.
  1. If the token generated in one DC (e.g. accounts.zoho.com) is used in another DC (e.g. crm.zoho.eu), the invalid_oauthtoken error will be thrown
  2. If you're using a deleted access token, invalid_oauthtoken error will be thrown. Since the validity for an access token is one hour, we have threshold (10 tokens) for number of active access tokens to be generated using a refresh token. Once the limit is exceeded, we will automatically delete the first created access token. As a best practice you can save the access token and reuse them.
  3. If you have recently deleted all the API tokens associated with your Zoho account when you changed your account password or deleted a connected app from your Zoho account, the invalid_oauthtoken will be thrown.

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