Seems like an odd notice, given that no corresponding announcements have been made on the forum. I thought it might be related to deprecated KDF settings, but that should not be possible if you are on the bitwarden.eu server.
The best thing to do would be to first ensure that your device is malware free (or find a malware free device), and then log in to the web vault by using a link from one of the other Bitwarden apps (e.g., go to Settings > About > Bitwarden Web App in the browser extension; or go to Help > Go To Web Vault in the Desktop app), or use the direct login link https://vault.bitwarden.eu/#/login.
If there is a legitimate issue, you will see a notice when you log in to the Web Vault app using one of the above methods. [Edited to Add: On re-reading your post, I see now that you did write that you saw no such notice when you logged in to your vault — but are you referring to the Web Vault, or one of the other Bitwarden apps or extensions?]
Overall, there are several red flags in the email text that lead me to believe it is not a legitimate email, but who knows, on occasion Bitwarden has been known for clumsy communication.
You may also want to analyze the email headers, by copying and pasting them into one (or both) of the following tools:
- Test DKIM, SPF, DMARC, DomainKey, RBL by Uploading Email Content - Online Test Tool
- Email Header Analyzer, RFC822 Parser - MxToolbox
Also, it would be helpful if you could provide more information about the link given (although you must be super careful so that you don’t accidentally launch the link). I would suggest right-clicking the link and selecting the option “copy link address” (or anything equivalent). Then, in your forum response, click the </> (Preformatted Text) button in the editor toolbar (or simply use the keyboard shortcut Ctrl+e) while the cursor is on a new (empty) line. You should then see the following:
```
type or paste code here
```
Paste the copied link over the text that says “type or paste code here”, and refrain from adding any other text to any of the three lines inserted by the </> function.