@Terence J Dorman | VBPNP Thank you for reaching out to us, would like to know what permission issues you are facing with Azure AD DS instance. Also as mentioned here very limited privileges are present for managed domain. Domain Administrator and Enterprise Administrator privileges aren't available for you to use within the domain.
Lets connect offline to discuss this further, if required we can engage the engineering team to get the permission issues resolved it for you.
Please send us an email on azcommunity [at] microsoft [dot] com referencing this issue with a subject line "ATTN:Givary"
Let me know if you have any further questions, feel free to post it back.