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This is because IP address tried too many times, so nextcloud blocked.
What we can do is, to login database, and delete the blocked ip.
mysql -U nextcloud;
show tables;
select * from oc_bruteforce_attempts;
DELETE FROM nextcloud.oc_bruteforce_attempts WHERE ip ="X.X.X.X";
Refer – https://help.nextcloud.com/t/cannot-login-too-many-requests/100905/12