No. In almost every case (see below for the exceptions), every message HAS location information. It should always be available from the email message. In the email, there will be a link to a web page that shows the location on a map. And allows the email recipient to reply.
The same is not true of SMS messages. For SMS messages, you have some control over what appears in the SMS message. The controls for this are located in the lower right corner of the Account tab at explore.garmin.com. Options allow including/excluding lat/lon as text in the message and a short link to a map page.
The only two cases where the message does not contain coordinates:
1) If you insist on sending a message without a fix, there are no coordinates available. The device will warn you when you try to do this. You have the option to wait for a fix or send anyway.
2) If you use the phone app (Earthmate or Explore, depending on the device) to send the message, you can suppress the coordinates. No idea why this "feature" is there. To the left of the box where you type the message text, there is "location pin" icon. Tapping there will turn coordinates on/off.
Sending email direct from the inReach - no problem - location shows both in the email body text, and the link displays the position on a 'chart'.
What I was doing was sending an email from my inReach account Social page. Email is received OK, but no coordinates. Which maybe isn't surprising, as it's 'skirting' the inReach itself?
Actually, neither do I. Sending an email from my account's Social page, with inReach ON (but not tracking) shows a blue triangle in my position, but dated 3 days ago. Sending an email from my account's Social page, with inReach OFF shows nothing - not even a link, but the body of the text.
This is the MapShare page. Sending the email with the link has nothing to do with anything. The STATE of the MapShare page is the same, whether you send the email with the MapShare link or not.
I can't account for the whatever is sent - or not sent - (for the MapShare link) when the inReach is off. It makes absolutely no sense for this to depend in any way on the on/off status of the device.
Even when the device is off, you expect the MapShare page to show the most recent known location of the device. This is the blue triangle (aka the head pointer). No matter how old that position might be. The head pointer will certainly be updated any time the device sends something (a message, a send track point, or whatever). I believe (but am not sure) that it will also be updated each time the device does an active mail check (either because you manually requested one or because the hourly automatic check occurred).
Note that you can hide the head pointer entirely by toggling the eyeball icon for the user name in the left sidebar of the map page. I don't know how (or if) this applies to MapShare specifically.
The presence of other data (such as sent track points) depends on the filter settings for the map page.
