OAuth Server, invalid Access Token

Hi,

TLDR:

I’m evaluating using WP Auth from NET Core. However, I’m getting a Bad Request when accessing the /oauth/me endpoint.

Details:
My client sends the authorize request like this:

https://backupshop.wpengine.com/oauth/authorize/?client_id=<redacted>&scope=basic&response_type=code&redirect_uri=https%3A%2F%2Flocalhost%3A5000%2Fcallback&state=CfDJ8NYqZtYibXVAl-HRi6IpPiSHYvUtcqUKR6HGaRybtfiuaXucDIskzWvRvgfxDoeKT9nDoDTmEU1dGT8WYJJzEqQ0wlRs6J0TmsrQiLbVZ_QiD_oxUXVTIRrgPR1F1Y_yKYlwZHeG3B-SEGMmCOL8oAHLeZ-nnMXJ-c3I2idXL4J4d0UJvM2tg3lXOrE7o11_OGlRhOQ3H2bdnqZh594-ROUsRUR3gbGczW_c-KhUBlIV-PhEvn4L1GZDNWDku3VNqliTwlBa4_VDNP6xeGxxWIYL_EOdsLkKKVBPapKtfUmO_EgVUc43gVAndmfsIrIA_A

Then gets a code at the callback URL and uses it successfully to get an access token:
https://backupshop.wpengine.com/oauth/token
with
client_id=<redacted>&redirect_uri=https%3A%2F%2Flocalhost%3A5000%2Fcallback&client_secret=<redacted>&code=sm3lyidi1iipwx6af96xfiwhdz8i3y0zxvhx439m&grant_type=authorization_code

The response contains the access token:
access_token=udgbhlgft7celbtvmulr718ewwpf3qeey3wtkczxnqayzixuyk0vd4ldfjv8

Then, as is usual for libraries wrapping external OAuth2 providers for ASP NET Core, it tries to get the profile info:
https://backupshop.wpengine.com/oauth/me
with
Authorization: Bearer udgbhlgft7celbtvmulr718ewwpf3qeey3wtkczxnqayzixuyk0vd4ldfjv8

However, the response is
Bad Request
with
{“error”:”invalid_request”,”error_description”:”Invalid token”,”error_uri”:”https:\/\/tools.ietf.org\/html\/draft-ietf-oauth-v2-31#section-7.2″}

However, the token sent was the right one. So I am somewhat at a loss here.

Any ideas?

Thanks,
Mark