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Please do read the documentation: https://www.akeeba.com/documentation/akeeba-backup-joomla/site-transfer-wizard.html

When entering the URL to your new site you used akeeba1.wedotraining.com as per your screenshot.

Here's what the documentation tells you:

Afterwards please enter the URL of the target site and click the Check button. You must enter the full URL to the target site including the http://or https:// prefix and any path to the site but without the index.php part. For example you need to enter something likehttps://www.example.com, http://subdomain.example.net or http://localhost/mysite>.

So, first problem right here. The documentation tells you to enter a URL. You didn't. You entered a bare domain name. A URL has a protocol (http:// or https://) in front.

Now, let's read the immediate next paragraph of the documentation:

The Site Transfer Wizard will check that the URL is accessible from your server.Please note that if the URL returns an error, including but not limited to 403 Forbidden and 500 Internal Server Error, you will receive a message telling you that the URL is inaccessible.

Here is the second problem. The subdomain you entered does not resolve in DNS!

See for yourself:

% dig akeeba1.wedotraining.com @1.1.1.1

; <<>> DiG 9.10.6 <<>> akeeba1.wedotraining.com @1.1.1.1
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 21686
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
;; QUESTION SECTION:
;akeeba1.wedotraining.com.	IN	A

;; AUTHORITY SECTION:
wedotraining.com.	38400	IN	SOA	ns0.sureline.net. domains.sureline.net. 2022112101 3600 3600 38400 38400

;; Query time: 341 msec
;; SERVER: 1.1.1.1#53(1.1.1.1)
;; WHEN: Fri Mar 03 18:43:51 EET 2023
;; MSG SIZE  rcvd: 113

As a result, Akeeba Backup tells you that you cannot proceed because you are trying to transfer your site to a URL which does not work. Even if it transferred the backup archive you would not be able to run Kickstart to extract it and the restoration script to restore it as they are web applications, therefore they need to be accessible from a URL.

Start by fixing these basic problems.