multi user access problem SMB

Hi to everyone, who helps me to solve the problem?
I created folders on my nas, limiting access only to some users, using username and password, the problem is that when a user is connected to the shared folder, another can not access, the error message that appears on windows 10 when I try to access is:
"multiple connections to a server or shared resource by the same user, using more than one user name, are not allowed. stop all previous connections to the server or shared resource and try again."
I need to connect more users to the same folder and not one at a time as it currently happens, how can I solve?
thank you.