Articles and verbs in error codes. What and when to use?

Before we get to the question, I’m a beginner at UX writing and English is not my native language, so I apologize in advance for the wording.
I need to write texts for error codes, for example:
No response from (the) bank.
Try the foll…
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Handling when app cannot connect to server via websockets?

I have a browser based video editing tool and one of the main issues I face is using websockets to stream information to the app in realtime. Some examples of why websockets are useful.
Automatic subtitles (transcription job can take 30s+…
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How to discourage screen capture and encourage users to copy a message instead?

When encountering an error message, some of our end-users have a tendency to take a screenshot, crop it and copy-paste it in a word document or a pdf, and then they mail us that PDF…
This is typically quite cumbersome and we lose the con…
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How to handle delivery time slots that expire before purchase is complete?

I have an e-commerce web app where you can choose among multiple time slots for your delivery. There are some rules that depend on when the purchase is completed.
For instance, if I purchase something before 2:00 PM, I’m able to select sa…
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Error on initial push notification subscription

Does it make sense to inform the user with an error message when initial registration to push notifications fails?
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Visual feedback for restricting drag and drop in a list

I have a table with a list of items. Users are able to drag and drop each item up and down to reorder the items.
I want to set some control in place. For example, in the table below, I want to disable the user from dragging …