Best answer by Transparent
Sorry to hear of this problem as a new customer. However, a solution is actually quite simple.
Ultimately you should be able to submit these online via the app or MyOVO, however it sounds like there is an issue here that needs resolving.
Don't wait for OVO to initialise your Account web-page and sort out the hold-up:
Email directly to Customer Services firstname.lastname@example.org with your full name & address, account number (if you know it) and the Meter Readings.
OVO will acknowledge your email and send the readings to ECOES (The National Meter Database). They in turn will notify your old Supplier, who have a narrow window of opportunity to raise any objections. Such objections are constrained by Ofgem rules, so it is quite unusual for one to be upheld. If your meter readings are within a reasonable estimate and you are not in substantial payment arrears, then I expect this process to be automatic.
After another fortnight, the old Supplier will raise your Final Bill. This delay is due to the statutory 14-day cooling off period for new Financial Contracts within the UK.
You do not need to contact your original Supplier at all. It is the responsibility of the Receiving Company to handle the switch administration.
Whatever "issue" OVO claim to have contacted you about cannot have been related to a Formal Objection because this could only be raised after ECOES have received your meter readings. At this stage they clearly have not!
Please post back here if you need any more help.