libnx fsFsCreateDirectory cannot create subdirectory?

[Icarus]

So I switched from stdio.h to libnx's file system and have created the following code:

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//only including this part of the code for clarity
TimeCalendarTime dumpdreamtime = util::getDreamTime();
char dreamtime[128];
const char* date_format = "%02d-%02d-%04d_at_%02d-%02d";
sprintf(dreamtime, date_format, dumpdreamtime.day, dumpdreamtime.month, dumpdreamtime.year, dumpdreamtime.hour, dumpdreamtime.minute);
std::string strislandname = util::getIslandNameASCII();
std::string g_pathOut = /config/luna/dump/;
g_pathOut += strislandname.empty() ? "[DA-" + util::getDreamAddrString(g_mainAddr) + "]" : ("[DA-" + util::getDreamAddrString(g_mainAddr) + "] " + strislandname);
util::PrintToNXLink((g_pathOut + "\n").c_str());

//here is the FS stuff
Result rc = fsFsCreateDirectory(&g_fsSdmc, g_pathOut.c_str());
util::PrintResultToNXLink(rc);

//boom, issue
g_pathOut += "/" + std::string(dreamtime);
util::PrintToNXLink((g_pathOut + "\n").c_str());
rc = fsFsCreateDirectory(&g_fsSdmc, g_pathOut.c_str());
util::PrintResultToNXLink(rc);

this produces the following output in my console over nxlink:

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/config/luna/dump/[DA-8037-5177-6075] Andromeda
Result: 2000-0000 | Value: 0x0
/config/luna/dump/[DA-8037-5177-6075] Andromeda/28-03-2022_at_07-07
Result: 2001-0106 | Value: 0xD401

As you can see, the creation of the first directory happens without error. Then, when the subdirectory is to be created, it errors.
I checked the error code on SwitchBrew, which Note reads "InvalidCurrentMemory".
That seems awfully ambiguous to me, so now I have no real idea why it has an issue with the filepath specified. i tried multiple formats, but couldn't find one, where it doesn't error out.

I would appreciate further assistance, thank you for your time.

[WinterMute]

Generally we would advise sticking with stdio functions rather than using these functions directly unless there's a particularly good reason.