POST /keys/upload gives error 400

[Gulianrdgd]

Currently I am trying to setup e2ee with the new initRustCrypto() everything works as far as I can see however my console is filled with POST requests to /client/v3/keys/upload with recieves error code 400:

{"errcode":"M_UNKNOWN","error":"One time key signed_curve25519:AAAAAAAAAA0 already exists ... "}

It tries to upload the keys everytime we do a SYNC request

.

I am starting the client like this:

this.client.initRustCrypto().then( 
() => {
	this.client.startClient({
		initialSyncLimit: settings.pagination,
		includeArchivedRooms: false,
	})

For me it is always the same curve and the same string behind the curve, regardless of which account is logged in. In issue #4132 a user reports the same issue but with AAA...8

[richvdh]

Can you tell us more about how you are creating the MatrixClient? Perhaps you could share a Short, Self Contained, Correct, Example.

It looks like the rust crypto library has forgotten that it has already created a one-time-key for this device with that ID, but this information should be stored in indexeddb.

This could happen if:

• you initialise two MatrixClient instances with the same access token, but your indexeddb isn't working (or you have cleared it out somehow), or:
• you have called the /login REST API, passing a device ID for a device that already exists.

[Gulianrdgd]

It was indeed that I deleted my indexdb. Removing all my cookies, sessions storage etc... Did the trick.

Thanks for the response