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Dear Alex Dugan,
Good day! Thank you for posting to Microsoft Community. We are happy to help you.
As per your description, please let us cooperate and please don’t worry, we can work together to narrow down and resolve the situation.
As you know that, in SharePoint list calculated column we cannot use cell number or ranges. For example: A39(in Excel cell).
You can use same formula but just replace cell number to SharePoint related created column name. However, based on my test, In SharePoint online list calculated column, EOMONTH is not working and not available as a function.
As a workaround you may use Microsoft Flow Power Automate trigger. For Flow trigger you may post in Microsoft Power Automate Community for expert assistance. This is a specific channel related with Power Automate Flow.
The reason I ask you to post is that in Answers forum, we have limited resources and very little knowledge about Power Automate and in Microsoft Power Automate Community, you will get the most qualified pool of respondents, and other partners who read the forums regularly can either share their knowledge or learn from your interaction.
Your understanding and patience will be highly appreciated. I hope that you are keeping safe and well!
Sincerely,
Waqas Muhammad