[Bug]: NC Desktop fails to poll for authorization

### ⚠️ Before submitting, please verify the following: ⚠️

- [x] This is a **bug**, not a question or a configuration issue.
- [x] This issue is **not** already reported on Github (I've searched it).
- [x] Nextcloud Server and Desktop Client are **up to date**. See [Server Maintenance and Release Schedule](https://github.com/nextcloud/server/wiki/Maintenance-and-Release-Schedule) and [Desktop Releases](https://nextcloud.com/install/#install-clients) for supported versions.
- [x] I agree to follow Nextcloud's [Code of Conduct](https://nextcloud.com/contribute/code-of-conduct/)

### Bug description

```
Upon granting access the client will hang indefinitely on polling for authorization

```

**Desktop Client Debug Logs**: [desktop.zip](https://github.com/user-attachments/files/18583808/desktop.zip)

### Steps to reproduce

```
1. Install the latest release version (Windows; Desktop; 3.15.3)
2. Follow the connection instructions
3. After granting access the window hangs on polling for authorization
```

### Expected behavior

```
After granting access, I would expect it to successfully poll then let me finish connecting the account.
```

### Which files are affected by this bug

Unknown

### Operating system

Windows

### Which version of the operating system you are running.

Windows 11

### Package

Official Windows MSI

### Nextcloud Server version

30.0.4

### Nextcloud Desktop Client version

3.15.3

### Is this bug present after an update or on a fresh install?

Updated from a minor version (ex. 3.4.2 to 3.4.4)

### Are you using the Nextcloud Server Encryption module?

Encryption is Enabled

### Are you using an external user-backend?

- [x] Default internal user-backend
- [ ] LDAP/ Active Directory
- [ ] SSO - SAML
- [ ] Other

### Nextcloud Server logs

```shell
There are no log entries for the polling failure.
```

### Additional info

Not entirely relevant, but I did try to switch to the beta or daily desktop channel, and those completely failed to download, and see no way to choose which channel to download from the main download page. It was my intention to test with the daily channel before reporting this.