Failed to create device user. (400073)

Hello I have a EX2100 and all I have done is sync my data from my old mirror to this device which will become my primary device. I am getting the below error when I create a user. Does anyone have any ideas?

Failed to create device user. (400073)

You may have better luck asking your question in the dedicated EX series sub forum where there may be others more familiar with the EX series.

https://community.wd.com/c/network-attached-storage/my-cloud-expert-series

That said, what is the “old mirror”? The My Cloud Mirror? and what does “sync my data” mean? Did you try to save the settings from one My Cloud to load on a different model My Cloud?

Hello Bennor, thank you for the reply. I have a 8tb my cloud mirror, which
is set up with raid 1. I enabled the features for remote sever, in order
to transfer my data to the be ex2100 8tb. System. Its setup as raid 0. I
just chose the sync option to transfer the data to my new ex2100. Which now
since the data is transfered over, (to the ex2100). I want to make the the
ex2100 primary and keep a constant sync job running back to the my cloud
mirror (i will first set the my cloud mirror to factory fault, make it raid
0, setup sync jobs for the shares). Right now I am just trying to create
the user accounts, and will give them access to the data. The user acct
creations process gives me that error during the creation process. Thanks
you for any suggestions you may have, its greatly appreciated.