Thank you to everyone who has offered suggestions.
The problem is solved and I'll tell you how below. But a couple of tidbits I learned on the way. First, there's an update on the Fitbit app that I hadn't installed. I did that but after I solved the issue of the Sept. 1 run upload. Hopefully the update will keep Strava and Fitbit in sync for future activities. I was able to sync Peloton workouts to Strava so the problem must have been with Fitbit/Strava communication.
The way I got the Sept. 1 run to show on Strava was to upload it manually. I went to the activity and clicked on the ellipsis on the top right. From the dropdown I chose Export as TCX file and saved on my desktop. Then went to Strava and hit the Plus sign inside the orange circle. From that dropdown selected Upload Activity and browsed for the file. Voila! Run appeared on my Strava feed GPS and all!
Here's a step by step, hopefully someone will find this helpful.
To Manually Upload from Fitbit to Strava
1. Go to activity you want to upload in Fitbit
2. Click the ellipsis on the top right
3. From the dropdown choose Export as TCX file
4. Save somewhere you can find the file
5. On Strava click the Plus sign inside the orange circle in the upper right
6. From the dropdown select Upload Activity
7. Browse for the file and Open
8. Done!
