OWA integration installation problem

OWA integration installation problem

1. I installed version 6.1 Build 6123 on Exchange 2019 CU12 on Server 2019

2. I downloaded the android app and was able to enroll the user

3. I verified I could log in to OWA.
I got the forms login page, and entered a username/password. This worked

4. I installed the OWA connector and verified that:
 <add name="ADSSPOWAModule" type="modules.IDMOWAModule,ADSSPOWAModule , version=1.0.0.0, culture=neutral, publicKeyToken=e3dbd12aee303d2d, processorArchitecture=AMD64" preCondition="" /> 
was added to the OWA web.config

5. I attempted to log in to OWA
I got the forms login page, and entered a username/password. I was redirected to (where XXX is my domain):
HTTP ERROR 401

The access log shows:
- /owa/RestAPI/WindowsLogonTFA "-" fe80:0:0:0:8d7b:f236:986b:c45a%15 192.168.244.12 POST [01/May/2022:22:37:55 +0100] 32 19 200 "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/101.0.4951.41 Safari/537.36 Edg/101.0.1210.32"

The adslog shows:
[22:37:55:249]|[05-01-2022]|[ADSLogger]|[INFO]|[88]: productHost fe80:0:0:0:8d7b:f236:986b:c45a%15|
[22:37:55:249]|[05-01-2022]|[ADSLogger]|[INFO]|[88]: productName null|
[22:37:55:249]|[05-01-2022]|[ADSLogger]|[INFO]|[88]: responseType null|
[22:37:55:249]|[05-01-2022]|[ADSLogger]|[INFO]|[88]: userName null|
[22:37:55:249]|[05-01-2022]|[ADSLogger]|[INFO]|[88]: domainName null|
[22:37:55:249]|[05-01-2022]|[ADSLogger]|[INFO]|[88]: requestURI /RestAPI/WindowsLogonTFA|
[22:37:55:249]|[05-01-2022]|[ADSLogger]|[INFO]|[88]: contextPath /owa|
[22:37:55:251]|[05-01-2022]|[ADSLogger]|[INFO]|[88]: Inside ADSSPAPIAuthorization - isAuthorized method|
[22:37:55:251]|[05-01-2022]|[ADSLogger]|[INFO]|[88]: requestAPI /owa/RestAPI/WindowsLogonTFA|
[22:37:55:251]|[05-01-2022]|[ADSLogger]|[INFO]|[88]: userName null|
[22:37:55:251]|[05-01-2022]|[ADSLogger]|[INFO]|[88]: domainName null|

The catalina log shows:
[22:37:55:276]|[05-01-2022]|[org.apache.struts.action.ActionMapping]|[WARNING]|[88]: Unable to find 'null' forward.|

NativeLog shows:
[22:37:55:262]|[05-01-2022]|[ADSMLogger]|[INFO]|[88]: Initialization Starts|
[22:37:55:263]|[05-01-2022]|[ADSMLogger]|[INFO]|[88]:  Normal flow  |
[22:37:55:263]|[05-01-2022]|[ADSMLogger]|[INFO]|[88]:  dcName for validDC HOST.YYY.local |
[22:37:55:264]|[05-01-2022]|[ADSMLogger]|[INFO]|[88]: ValidDC 1.HOST.SysDev.local |
[22:37:55:264]|[05-01-2022]|[ADSMLogger]|[INFO]|[88]: after pDirSearch release |
[22:37:55:264]|[05-01-2022]|[ADSMLogger]|[INFO]|[88]: Checking for a ValidDC finished |
[22:37:55:264]|[05-01-2022]|[ADSMLogger]|[INFO]|[88]: serverDetails->ldapDCPath:  LDAP://HOST.YYY.local/ |
[22:37:55:264]|[05-01-2022]|[ADSMLogger]|[INFO]|[88]: Initialization Finished|
[22:37:55:271]|[05-01-2022]|[ADSMLogger]|[INFO]|[88]: Initialization Starts|
[22:37:55:271]|[05-01-2022]|[ADSMLogger]|[INFO]|[88]: serverDetails->ldapDCPath:  LDAP://HOST.YYY.local/ |
[22:37:55:271]|[05-01-2022]|[ADSMLogger]|[INFO]|[88]: Initialization Finished|

Is there a missing step in the instructions?

Many thanks !