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Ops Manager new install, unable to login

I wanted to try Ops Manager so I installed it on an Ubuntu18 following the suggested test deployment by having the mongo application DB on the same server
https://docs.opsmanager.mongodb.com/current/tutorial/install-simple-test-deployment/

Ops Manager started successfully, I connected directly via the public IP address and went through the setup webpages, during which I also configured a FQDN for Ops Manager (routed via CloudFront with SSL offloading). I finished the configuration and the page displayed was “setup new project”. I then logged out.
I have been unable to log back in. I used forgotten password to reset the password several times, but with the same result. I also tried bypassing cloudfront by opening the website using the host’s public IP address, but the login result was the same…

After clicking login the page refreshes and shows the login page again.

Taking a look at the logs…
mms0.log

2020-05-27T05:34:02.586+0000 [JettyHttpPool-35] INFO  com.xgen.svc.mms.res.user.UserResource [UserResource.java.authV1:1027] - Login attempt from addr="xxxxxxx" username="xxxxxxx" result=SUCCESS

I can see my authentication is successful.

looking at mms0-access.log I can see the requests which look ok, except for some 404s on fetching map files

xxxxxxxxx - - [27/May/2020:05:34:02 +0000] "POST /user/v1/auth HTTP/1.1" 200 285 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.138 Safari/537.36"
xxxxxxxxx - - [27/May/2020:05:34:02 +0000] "GET / HTTP/1.1" 303 0 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.138 Safari/537.36"
xxxxxxxxx - - [27/May/2020:05:34:02 +0000] "GET /user/login HTTP/1.1" 303 0 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.138 Safari/537.36"
xxxxxxxxx - - [27/May/2020:05:34:03 +0000] "GET /user HTTP/1.1" 200 2388 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.138 Safari/537.36"
xxxxxxxxx - - [27/May/2020:05:34:04 +0000] "GET /uiMsgs HTTP/1.1" 200 2 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.138 Safari/537.36"
xxxxxxxxx - - [27/May/2020:05:34:04 +0000] "GET /static/dist/registration_v2.min.js.map HTTP/1.1" 404 2484 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.138 Safari/537.36"
xxxxxxxxx - - [27/May/2020:05:34:04 +0000] "GET /static/assets/css/nprogress.min.css.map HTTP/1.1" 404 2484 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.138 Safari/537.36"
xxxxxxxxx - - [27/May/2020:05:34:04 +0000] "GET /static/assets/css/thirdparty.min.css.map HTTP/1.1" 404 2484 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.138 Safari/537.36"
xxxxxxxxx - - [27/May/2020:05:34:04 +0000] "GET /static/dist/styles.min.css.map HTTP/1.1" 404 2484 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.138 Safari/537.36"
xxxxxxxxx - - [27/May/2020:05:34:04 +0000] "GET /static/dist/bem-components.min.css.map HTTP/1.1" 404 2484 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.138 Safari/537.36"

Any suggestions on how to resolve this?

Only way to resolve this was a complete reinstall of Ops Mgr.
It turns out that you must either create a Project (or add an additional users which also creates a Project) in Ops Mgr before your first logout.