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Meltir
Have you tried following https://docs.microsoft.com/en-us/sharepoint/dev/solution-guidance/security-apponly-azureacs ? (from https://github.com/vgrem/phpSPO#authentication) I have not done this myself (we have a team that handles sharepoint and they followed the above steps), but it is...
Try including the site itself in the url for your site: https//mydomainname.sharepoint.com/sites/foobar