Please follow these steps sequentially:

Step 1: Verify Login
Make sure you are logged into the DraftSight website using your 3DEXPERIENCE ID before attempting to submit any requests or tickets.

If you do not have a valid 3DEXPERIENCE ID, please create one using steps provided in below post: https://www.3ds.com/support/new-to-support/new-customers-resources/3dexperience-id-creation   

Step 2: Clear Browsing Data
•    Open your preferred web browser (e.g., Google Chrome or Microsoft Edge).
•    Navigate to:
Settings > Privacy and security > Clear browsing data
•    Choose to clear Browsing history, Cookies and other site data, Cached images and files
Restart your browser.
•    Attempt to submit the ticket using: https://www.draftsight.com/support/request-form 

Step 3: Reset Browser Settings
•    Open your web browser.
•    Go to: Settings > Reset settings
•    Select "Restore settings to their original defaults".
•    Confirm the reset.
•    Restart the browser.
•    Try submitting the ticket again.

Step 4: Use Incognito Mode
If the issue still occurs:
•    Open your browser in Incognito (Private) Mode.
•    In Chrome/Edge: Click the three-dot menu > "New Incognito Window" or "New InPrivate Window".
•    Go to the DraftSight website.
•    Log in with your 3DEXPERIENCE ID.
•    Attempt to submit the ticket again.