Why can't I view my historic usage information following a switch away?

My fixed price plan for gas and electricity supply by Ovo ended on 21 Nov.

Since this morning, 22 Nov, I can still log in to My Ovo but it no longer shows me electricity usage information, whereas the smartphone Ovo Energy app does.

I the past, I was supplied by Ovo at two other addresses and, because moving was a complicated process with overlaps, there were periods when I even had 3 accounts live at once.

Even though the other two accounts have been closed for months now, I am still able to see usage etc (via the web portal and using the smartphone app) at those addresses up until their final supply dates.

Here’s the bug: what I can see is obviously determined by what Ovo thinks it is supplying me with today - Ovo thinks it is supplying me with gas only, and all the electricity usage information has disappeared from My Ovo (for all three accounts).

I suspected that it was a “feature” that still let me see historic information for the other accounts, but was happy with that so didn’t report it as a bug.

But I feel I ought to be able to review my usage for the final day of electricity supply by Ovo, and this denial of access is all rather abrupt, so this time I’m reporting it as a bug.

The smartphone app, more reasonably, continues to show me electricity supply information, (even for closed accounts) and if the last day of half-hourly info for electricity usage it shows me is 19 Nov, at least it shows me that - the web portal now denies access to all my electricity supply info, ever.

To put it bluntly - the web portal is using the current, live supply info to control what it shows in the way of historic supply information, including from other accounts. I have previously reported that the web portal can get hopelessly confused over addresses: I told Ovo that I was “Moving out” of the other two addresses and it then persisted in showing me messages about moving out of my still-active supply address.

Fortunately, I know how to use Ovo’s not-supported-for-public-use API, and the historic usage data is still accessible there, for electricity as well as gas, so I have been able to download it anyway (including electricity, including for 20 Nov). For whatever reason, the usage data for 21 Nov is currently only for gas. Perhaps the only reason that I can see any data at all on My Ovo is that Ovo (wrongly) thinks it is still my supplier of gas. (I received an email this morning about moving to the variable tariff for gas today. I am, but not supplied by Ovo, I’m not.)

Perhaps the reason it has no electricity usage data for 21 Nov is that it thinks I switched at midnight on 20/21 Nov. But that’s not right either. For clarity, the switch was for electricity and for gas, and the last day of supply by Ovo was 21 Nov, i.e. the last day of my fixed price plan.

[Edit: update - actually the smartphone app is losing access to usage data now. I suppose things get updated in stages. At this point, the “yearly” info is available, i.e. consumption resolved by the month, but not “monthly” or “daily”. Meanwhile the web portal hasn’t changed. All frequencies still there, but only for gas.]