Is this something that worked and then stopped, or something that was broken after a build update? The insider app requires a Microsoft account in order to work, are any store apps giving you issues as well? Do you have secure boot enabled in the bios?
A ask about secure boot because it uses the tpm. I have seen and also encountered an issue during a build update where the update did not successfully carry forward the tpm keys. This effectively locked the account out of the registered applications. For me to fix this I had to disassociate my Microsoft account from my login user, reset the tpm which is done via mc snapin within windows, restart the computer and then relink my account to my Microsoft account. As soon as I relinked all my apps automatically downloaded and all worked fine.
If you DO have a TPM issue you will see messages in the event viewer..