Permalink Setting Issue

Hello,
Our website have a new problem which is related to permalink setting.
Our test server ip address is: http://34.219.71.204/
I want to change the permalink setting from custom structure to post name, but all product link is broken once I have changed setting.
The previous permalink setting is Custom Structure: http://34.219.71.204/index.php/%year%/%monthnum%/%day%/%postname%/
Once I changed to post name permalink, I cannot change back to custom structure. The page shows:
Not Found
The requested URL was not found on this server.
Apache/2.4.29 (Ubuntu) Server at 34.219.71.204 Port 80

How can we solve this problem,
Sincerely,
Olivia

Hello,

Please check how it works with the default WordPress theme just to check whether the issue is with our theme or not.

Because the permalinks are default WordPress functionality and our theme doesn’t influence.

Best Regards.

[Author]

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