I removed my custom field as you described and I enabled the “public version” from David intervals.icu for “muscle mass”.
However syncing still not work. Here the content of the log file:
2023-12-19 10:56:55.9330 DONE loadWithingsPreferences withingsPref(syncWeight: true, syncBodyFat: true, syncDiastolicBP: true, syncSystolicBP: true, lastSyncDate: "19/12/2023", syncToIntervalsIcu: false, syncToStrava: false, syncToGarmin: false, syncHr: true, syncMuscleMass: true, userId: "", refreshToken: "")
2023-12-19 10:56:55.9720 Existing Plist File Exists - Update/Write
2023-12-19 10:56:55.9720 DONE ----- saveUserPreferences ----- DONE
2023-12-19 10:56:55.9730 Existing Plist File Exists - Update/Write
2023-12-19 10:56:55.9740 DONE ----- saveUserPreferences ----- DONE
2023-12-19 10:57:09.9980 DONE loadWithingsPreferences withingsPref(syncWeight: true, syncBodyFat: true, syncDiastolicBP: true, syncSystolicBP: true, lastSyncDate: "19/12/2023", syncToIntervalsIcu: false, syncToStrava: false, syncToGarmin: false, syncHr: true, syncMuscleMass: true, userId: "", refreshToken: "")
2023-12-19 10:57:10.5100 [SUCCESS ] workoutDelete - removeItem at withingsData.csv
2023-12-19 10:57:10.5170 IntervalsIcu.uploadWellnessCSV - Uploading:/withingsData.csv - SUCCESS
2023-12-19 10:58:49.6690 DONE loadWithingsPreferences withingsPref(syncWeight: true, syncBodyFat: true, syncDiastolicBP: true, syncSystolicBP: true, lastSyncDate: "19/12/2023", syncToIntervalsIcu: false, syncToStrava: false, syncToGarmin: false, syncHr: true, syncMuscleMass: true, userId: "", refreshToken: "")
2023-12-19 10:58:50.2410 IntervalsIcu.uploadWellnessCSV - API Error.. 422 errorMessage: Row 50 2023-05-29: Invalid resting HR
2023-12-19 10:58:50.2780 [SUCCESS ] workoutDelete - removeItem at withingsData.csv
2023-12-19 10:58:54.7480 Existing Plist File Exists - Update/Write
2023-12-19 10:58:54.7530 DONE ----- saveUserPreferences ----- DONE
2023-12-19 11:01:45.4220 DONE loadWithingsPreferences withingsPref(syncWeight: true, syncBodyFat: true, syncDiastolicBP: true, syncSystolicBP: true, lastSyncDate: "19/12/2023", syncToIntervalsIcu: false, syncToStrava: false, syncToGarmin: false, syncHr: true, syncMuscleMass: true, userId: "", refreshToken: "")
2023-12-19 11:01:45.4830 Existing Plist File Exists - Update/Write
2023-12-19 11:01:45.4840 DONE ----- saveUserPreferences ----- DONE
2023-12-19 11:01:45.4850 Existing Plist File Exists - Update/Write
2023-12-19 11:01:45.4850 DONE ----- saveUserPreferences ----- DONE
2023-12-19 11:01:48.6570 Existing Plist File Exists - Update/Write
2023-12-19 11:01:48.6580 DONE ----- saveUserPreferences ----- DONE
2023-12-19 11:01:49.5760 [SUCCESS ] workoutDelete - removeItem at withingsPref.plist
2023-12-19 11:02:07.3190 loadWithingsPreferences - No Plist. Use Default:withingsPref(syncWeight: true, syncBodyFat: true, syncDiastolicBP: true, syncSystolicBP: true, lastSyncDate: "19/12/2023", syncToIntervalsIcu: false, syncToStrava: false, syncToGarmin: false, syncHr: true, syncMuscleMass: true, userId: "", refreshToken: "")
2023-12-19 11:02:14.4100 Creating New Plist File
2023-12-19 11:02:14.4120 DONE ----- saveUserPreferences ----- DONE
2023-12-19 11:02:14.4310 DONE loadWithingsPreferences withingsPref(syncWeight: true, syncBodyFat: true, syncDiastolicBP: true, syncSystolicBP: true, lastSyncDate: "19/12/2023", syncToIntervalsIcu: false, syncToStrava: false, syncToGarmin: false, syncHr: true, syncMuscleMass: true, userId: "", refreshToken: "")
2023-12-19 11:02:14.4320 Existing Plist File Exists - Update/Write
2023-12-19 11:02:14.4330 DONE ----- saveUserPreferences ----- DONE
2023-12-19 11:02:34.0870 DONE loadWithingsPreferences withingsPref(syncWeight: true, syncBodyFat: true, syncDiastolicBP: true, syncSystolicBP: true, lastSyncDate: "19/12/2023", syncToIntervalsIcu: false, syncToStrava: false, syncToGarmin: false, syncHr: true, syncMuscleMass: true, userId: "", refreshToken: "")
2023-12-19 11:02:34.7360 IntervalsIcu.uploadWellnessCSV - API Error.. 422 errorMessage: Row 50 2023-05-29: Invalid resting HR
2023-12-19 11:02:34.7630 [SUCCESS ] workoutDelete - removeItem at withingsData.csv
2023-12-19 11:02:52.6070 DONE loadWithingsPreferences withingsPref(syncWeight: true, syncBodyFat: true, syncDiastolicBP: true, syncSystolicBP: true, lastSyncDate: "19/12/2023", syncToIntervalsIcu: false, syncToStrava: false, syncToGarmin: false, syncHr: true, syncMuscleMass: true, userId: "", refreshToken: "")
2023-12-19 11:02:53.1960 IntervalsIcu.uploadWellnessCSV - API Error.. 422 errorMessage: Row 50 2023-05-29: Invalid resting HR
2023-12-19 11:02:53.2210 [SUCCESS ] workoutDelete - removeItem at withingsData.csv
2023-12-19 11:02:55.7270 Existing Plist File Exists - Update/Write
2023-12-19 11:02:55.7320 DONE ----- saveUserPreferences ----- DONE