REST API is not working

[semboku]

I upgraded to Magento CE 2.1.8 and now the REST API quit working. 

When I go to:

http://somedomain.com/rest/V1/customers/me

I get this:

<response>

      <message>Consumer is not authorized to access %resources</message>

      <parameters>

            <resources>self</resources>

      </parameters>

</response>

In admin:

Cookie Lifetime 3600

Cookie Path /

Cookie Domain my url

Use HTTP Only yes

Cookie restriction mode yes

Any ideas?

[Tom Robertshaw]

Which authentication method are you using? http://devdocs.magento.com/guides/v2.0/get-started/authentication/gs-authentication.html