/vismanetapi/how-tos/fix401error section Are you getting a 401 Unauthorized error despite having a valid Access Token? Read more about how to solve this frequently asked question. 2026-05-18T09:29:51+02:00 # Fix 401 Unauthorized errors despite valid token Are you getting a 401 Unauthorized error despite having a valid Access Token? Read more about how to solve this frequently asked question. ## Overview This usually happens when the wrong Tenant Id is used during App Store setup. When connecting applications using an invitation code, make sure to select the **Company Tenant ID** as the organization, not the **Customer Tenant ID**. Both will let you authenticate through Visma Connect, but using the customer tenantId will return a 401 Unauthorized when sending requests to the Visma Net APIs. This is easy to mix up when the **Customer** and **Company** share the same name. To find the correct tenantId, go to → [Visma Admin](https://admin-user-access.visma.net/) → Company → Select the company → Edit → Configuration → Tenant id.  Make sure this Tenant ID from Visma Admin matches the one in the App Store before using the invitation code.  If it does not match, use the **"Change organization"** dropdown menu to select the organization whose Tenant ID matches.