This may indicate that you had initially activated the product but had since gone offline (or was not able to sign in to the CONNECTION Client) and your offline use grace period has ended. When your administrator has permitted offline use, you can use the product offline for a limited number of days. Once this has expired, you must activate the product to continue using it. This is done using the steps further above. In short, you must sign in to the CONNECTION Client when connected to the internet and ensure your sign-in is associated with your organization.
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This can happen if you left the product open while putting your computer into Sleep mode, or if you lose your internet connection while the product is open, and the connection is re-established. Your administrator may have disabled offline use (potentially along with setting concurrent use alerting), so the product will need to be closed to prevent usage from recording, which may result in over-usage if all licenses are already in use. Please save your work, close the software, then re-open it. Note that this behavior is changed starting with an update to the CONNECTION Client in November, 2020. See more here: Offline use license shutdown
The "Expires" column in the Bentley Licensing Tool (or "days before disabled" for some versions) shows the date that the product will no longer be licensed, IF it is not able to activate earlier. This applies to cases where the administrator has enabled Offline Use, in which case you have a seven-day grace period where the product can be used offline (no internet or CONNECTION Client). This is what the "expires" date reflects in the Licensing Tool. It does not necessarily mean that your product is about to expire, but rather that it will expire if you are offline until that date. If you are able to sign in to the CONNECTION Client and open the product the next day for example, the "expires" date will increment by one day.
I'm sure you have tried that one but I am asking anyway: Have you switched stteam to offline-mode after loading omsi to the main screen? Gave me a margin of about 5 fps
Some people in the German part of the forum say, that this soved the one or other problem...