Hello @javier ,
Thanks for your query !
Can you validate if your storage account is firewall enabled ?
Steps:-
Azure Portal -> Storage Account -> Networking -> Check Allow Access From (All Networks / Selected Networks)
If it is "Selected Networks" - It means the storage account is firewall enabled.
If the storage account is firewall enabled , check your angular app is whitelisted to access.
Couple of additional work arounds mentioned here
https://stackoverflow.com/questions/24492790/azurestorage-blob-server-failed-to-authenticate-the-request-make-sure-the-value
Let us know if the above steps helps out in resolving the issue , please don't forget to Upvote and Accept the Answer