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That's not good !
Is Wi-Fi turned On in the routers settings.
The Vodafone Connect Router is a plug and play device so really should just work if everything is toggled On.
Do your devices Wi-Fi work when connected to other Wi-Fi outlets.
Have you tried forgetting the network and reset the Wi-Fi settings back up.
Try another Wi-Fi channel in the router.
Some devices prefer 5Ghz to 2.4Ghz so splitting the frequencies in your Router to both can help by choosing each one to see if it makes a difference.
Has it worked previously and just stopped or is this the first time you've plugged it in ?
If this was me I would contact the Vodafone Broadband Team and they will advise further as the unit may have developed a fault.
They can access your account and help you further with this situation.
08080 034 515 for Home Broadband support (free from all UK landlines and mobiles.
Current Phone > Samsung Note 10+ 5G _256Gb > Model: SM-N976B.
Samsung One Ui 2.1 / Android 10.
Samsung Gear s3 Frontier Watch.
Samsung Galaxy Buds.