Unable to verify domain through Google Search Console

Hello, I’m trying to do the above via https://search.google.com/search-console/welcome?utm_source=about-page, however every time I’m getting the folowing error: “Could not find your domain. Confirm that you provided the correct domain for your property.”.

I have added various verification TXT entries multiple times and waited enough for propagation, but no luck.

The domain is accessible trough a browser. If howevever you do dig -t txt happybeeclothes.co.uk, the response is SERVFAIL:

 dig -t txt happybeeclothes.co.uk

; <<>> DiG 9.11.3-1ubuntu1.16-Ubuntu <<>> -t txt happybeeclothes.co.uk
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 45288
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 65494
;; QUESTION SECTION:
;happybeeclothes.co.uk.         IN      TXT

;; Query time: 266 msec
;; SERVER: 127.0.0.53#53(127.0.0.53)
;; WHEN: Sat Jan 01 20:08:45 UTC 2022
;; MSG SIZE  rcvd: 50

Two things to note though:

• when I purchased the domain, I couldn’t add it to my Droplet. I had to ask DO to help me verify that I’m the (current) owner of the domain,
• domain has been purchased through Namecheap, but again you can access the website hosted on my Droplet.

What am I doing wrong?

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Edit: DO own tool also doesn’t find any TXT records on my domain, even though I have now 3 of them: https://www.digitalocean.com/community/tools/dns?domain=happybeeclothes.co.uk