Timesheet notes in REST API is implemented in PPM 9.63 (tentatively due for release in early Dec'20).
You can now view & add notes when creating/updating timesheet/timesheet line through REST API.
The change will not be leveraged in the "old" existing mobile timesheet entry , but will be when we start reworking the new Timesheet Mobile entry, hopefully in PPM 9.64.
as Etienne mentioned in the mail. If you're a delegate, you're able to approve TM. which is available in PPM9.60.
Regarding Enable tracking notes in Mobile/ REST API, please confirm the below requirements. anything else?
1. be able to add notes when approve TM
2. be able to add notes when reject TM
3. be able to add notes when submit TM