Trying to verify session leads to an error (An error occured. Please try again later.)

### Steps to reproduce

1. Where are you starting? What can you see?
In settings -> security, under My sessions
2. What do you click?
Tap any red unauthorised session

Issue is random, with few sessions

### Outcome

#### What did you expect?

Let me verify session

#### What happened instead?

showing error

https://github.com/element-hq/element-ios/assets/79854020/23f3f3c6-4a93-4bb9-82c4-fe3f30484411

### Your phone model

iPhone 12

### Operating system version

17.0

### Application version

v1.11.6

### Homeserver

matrix.org

### Will you send logs?

Yes

Start in Settings > Security > My sessions and reproduce the failure by tapping a red unauthorised session on an iPhone 12 running iOS 17 and Element iOS v1.11.6. Check the available logs for the verification error; done means the selected session can be verified instead of showing the generic error.

Written by the indexing model from the issue text.