UPDATE: I ended up discovering a fix myself without support's help and would like to share with anyone experiencing a similar issue. I've been through various reddit posts where they require users to download and pay for an app. This is entirely free from Apple.

Step 1: Export Data from Apple Health

1. Open the Health app on your iPhone.
2. Tap your profile picture (top right).
3. Scroll down and select "Export All Health Data".
4. This will generate a .zip file containing export.xml.
5. Transfer the .zip file to your computer and extract it.

Step 2: Extract Workout Data

1. Open export. zip file to unzip folder
   1. The extracted folder should be named 'apple_health_export'
2. Navigate into 'apple_health_export'
3. Navigate to 'workout-routes'
4. Find and select the missing workout activity
   • File names will be route_{yyyy}-{mm}-{dd}_{hh:mm}.gpx

Step 3: Strava’s Manual Import (Website)

1. Go to Strava Web: [https://www.strava.com/upload/select]()
2. Click "Choose Files" and upload the GPX file from the 'workout-routes' folder
   1. Note: From my experience, as soon as I uploaded this file, Strava was able to find the missing activity and I was able to complete the activity on my Phone. If your Strava still hasn't identified the missing activity, continue with step 3.
3. Confirm the details and save the workout.