Quartus Prime Pro 18.1 works fine on our floating licence. Standard edition cannot find the licence server at all. Therefore we are having to use older version of Quartus II to support legacy devices. Looking at your website it seems to infer that if you have Pro licence you get Standard as part of the package. Why does ours not support standard edition?
Welcome to INTEL forum. To narrow down this issue. Can you provide your
1) Machine OS information
2) License.dat file
And for privacy, you can also reply/attach your file in private message.
I found the solution.
To the system environmental variables seems to fix this issue.