OAUTH2 flow credentials retrieve access_token

hello, Martin. Can you help me to solve the error for OAuth2 flow credentials retrieve access_token, the url as follow:
curl -X POST http://10.4.2.98:8080/testapi10/oauth/token/ -H ‘Authorization: Basic YWRtaW5AZGVmYXVsdC5jb206ZXhjZWwxMjM=’ -H ‘Content-type: application/x-www-form-urlencoded’ -d ‘client_id=d8db527d1e764775bf034cfff6c63e21&client_secret=NWNmZjZmNjgtODgxNy00MTg0LTkzNjgtODQ4MWY4ZWFjMzUw&grant_type=client_credentials’
{
“error”: “Bearer token malformed”
}

Gateway log:
localhost systemd: Starting Session 70 of user root.
localhost chronyd[603]: Source 193.228.143.14 replaced with 5.79.108.34
localhost systemd: Started Session 71 of user root.
localhost systemd: Starting Session 71 of user root.
localhost systemd: Started Session 72 of user root.
localhost systemd: Starting Session 72 of user root.
localhost systemd: Started Session 73 of user root.
localhost systemd: Starting Session 73 of user root.
localhost dbus[561]: [system] Activating service name=‘org.freedesktop.problems’ (using servicehelper)
localhost dbus[561]: [system] Successfully activated service ‘org.freedesktop.problems’
localhost tyk: time=“Sep 3 18:55:52” level=info msg=“Retrieved OAuth client list” apiID=2732ae415c3944a554fa5daa19b10805 status=ok
localhost tyk: time=“Sep 3 18:55:54” level=info msg=“Retrieved OAuth client ID” apiID=2732ae415c3944a554fa5daa19b10805 client=d8db527d1e764775bf034cfff6c63e21 status=ok
localhost tyk: time=“Sep 3 18:55:54” level=info msg=“Retrieved OAuth client ID” apiID=2732ae415c3944a554fa5daa19b10805 client=d8db527d1e764775bf034cfff6c63e21 status=ok
localhost tyk: time=“Sep 3 18:56:48” level=info msg=“Bearer token malformed” origin=10.4.2.98 path=“/testapi10/oauth/token/”
localhost tyk-pump: time=“Sep 3 18:56:57” level=info msg=“Purging 1 records”
localhost tyk-pump: time=“Sep 3 18:56:57” level=info msg=“Writing 1 records”

The problem detail description refer the url: Appear "Bearer token malformed" error for OAuth 2