Problem Statement:
Following the submission of an experience form created using the Sitecore Forms application in Sitecore 10.1.1, you may encounter the following message:
"Your session has expired. Please refresh this page."
Note -Data is being saved in the database only issue with the alerts.
Solution:
After engaging in a discussion with Sitecore support, it has been identified that our current issue aligns with bug#479471 ("The Session is expired message is shown when you submit a form"), which has already been addressed in Sitecore Experience Platform 10.1.2. For more detailed information, please refer to the release notes available at https://dev.sitecore.net/Downloads/Sitecore%20Experience%20Platform/101/Sitecore%20Experience%20Platform%20101%20Update2/Release%20Notes.
To resolve this issue, I recommend applying the latest pre-release for Sitecore 10.1, as outlined in the following article (https://sitecore.service-now.com/kb?id=kb_article_view&sysparm_article=KB1001300), or alternatively, consider upgrading to Sitecore Experience Platform 10.1.2 by following the Update Installation Guide.
Please note, You can just copy-paste content from "..delta.scwdp.zip" packages to the corresponding sites. Or you can use SIF to write script that will automatically deploy the necessary packages to the corresponding sites.
Please see the following article for more details: https://doc.sitecore.com/xp/en/developers/101/platform-administration-and-architecture/install-a-sitecore-xp-pre-release-using-sif.html
