I just spotted your post and wanted to find out if you still require help, as it has been a while since you last reported.
I looked at your account and can see that you have an enterprise account. As an enterprise user, you'll need your company admin to upload custom fonts in Adobe Express. Please contact your admin for font uploads. If you are the admin, please ensure you're logged in with the correct profile.
Please let me know how things are going, as I'm here to support you in any way I can, and looking forward to hearing from you.