My development environment domain became "not found"

I used my development environment successfully 6 months ago to test and experiment OAuth2.0 with my API GW. Now when I am trying to utilize again my test applications I get redirected to “not found”:
browsing to gives me not found
curl --request POST --url --header ‘content-type: application/json’ --data ‘{“client_id”:“XXX”,“client_secret”:“YYY”,“audience”:“https://correct_audience”,“grant_type”:“client_credentials”}’
gives me “not found”
I only added MFA to my tenant when I logged on after 6 months
How can I test again with the same development tenant and applications?
Thank you,
Aviv Simionovici

Please disregard this topic - I was able to invoke with POSTMAN (probably some typo in my CMD CURL…)