Hi,  @KaTaLy5t 

Thank you very much for posting on our business forum.

We would like to suggest that you try upgrading your OC220 to the latest firmware first to see if it resolves the issue you encountered. You can get the latest firmware via the link below: OC220 | Omada Hardware Controller | Omada Network Support

If the issue still persists after the upgrade, would it be convenient for you to share a screenshot of your Daylight Saving Time settings on the Site View interface? We will input your Site View configuration into the controller in our lab to see if we can reproduce the problem you are experiencing.
 

Thank you very much for your cooperation.

 Hi  @Jeremy_12,

Thanks for the response. I updated the OC220 to firmware version 1.4.10 Build 20260408 Rel.49847 through the firmware update prompt that pops up when you log into the controller. This is the latest firmware for V1 of the OC220 (the version I have) according to the link you gave me as well. 

I still have the same issue after the update. You can see the "invalid request parameters" error at the top of the first image. 

I thought that perhaps the manual DST settings in the controller were preventing me from using auto DST for the site so I went back to the global settings and changed the controller itself to auto DST and that accepted the change and is showing the correct time in the System Settings page but I still cannot set DST for the site. I also tried manual DST for the site but get the same error when I try to enable manual DST. The second screenshot below shows the Controller DST Settings.

Hi, @KaTaLy5t 
To better assist you, I've created a support ticket via your registered email address and escalated it to our support engineer to look into the issue. The ticket ID is TKID260427664, please check your email box and ensure the support email is well received. Thanks!