Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hi Heather,
Based on your description, you are receiving "This form cannot be opened in a Web browser. To open this form, use Microsoft InfoPath." when you try to open an InforPath form from a SharePoint server.
First, we'd like to confirm which version of the InfoPath you are using. If you are using InfoPath 2010, we’d like to inform you that there are some features unavailable in Web browser forms when using InfoPath 2010.
Here is an article for your reference: InfoPath 2010 features unavailable in Web browser forms.
Regards,
Tisky